add GetTimerXParams

a8/xtimer.cc

@@ -251,6 +251,11 @@ namespace a8
         }
     }
 
+    a8::XParams& GetTimerXParams(xtimer_list* timer)
+    {
+        return timer->param;
+    }
+
     void XTimer::UpdateTimer()
     {
         struct xtvec_base *base = base_;

a8/xtimer.h

@@ -40,6 +40,7 @@ namespace a8
         void DeleteTimer(xtimer_list* timer);
         //通过关联的list_head获取定时器对象
         xtimer_list* GetTimerByAttach(list_head* attach_entry);
+        a8::XParams& GetTimerXParams(xtimer_list* timer);
 
     private:
         void UpdateTimer();